Composite brazing material and preparation method thereof

A technology of brazing materials and alloy materials, applied in the direction of welding/cutting media/materials, welding equipment, welding media, etc., can solve the problem of inability to obtain extremely thin composite cladding layer, difficult operation of explosion method, and difficulty in the accuracy of composite layers, etc. problems, to avoid material oxidation problems, reduce brazing residual stress, and improve the effect of seam filling ability

Active Publication Date: 2017-01-04
BEIJING INST OF NONFERROUS METALS & RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of rolling cladding is that it is difficult to control the precision of the cladding layer. Due to intermediate annealing, an extremely thin cladding layer cannot be obtained; the interface of the extrusion method is mechanically bonded, and the bonding strength is low; the explosion method is difficult to operate and difficult to control

Method used

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  • Composite brazing material and preparation method thereof
  • Composite brazing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Preparation of Composite Brazing Material (1)

[0027] a) Vacuum smelting of silver, copper and tin to produce silver-copper-tin ingots, the composition mass percentage is: Ag 60%, Cu 28%, Sn 12%; melting temperature is 950°C.

[0028] b) Solution treatment of silver-copper-tin ingot: 530°C, heat preservation for 2.5 hours, water quenching;

[0029] c) Rolling of silver-copper-tin ingots: cold rolling into plates to a thickness of 2mm; each reduction is 10%.

[0030] d) Cutting: Cut the silver copper tin plate and pure silver plate to 70×70mm;

[0031] e) Pretreatment: sand the cut silver-copper-tin plate and sterling silver plate with sandpaper, clean them with alcohol, and dry them with cold air;

[0032] f) Hot press diffusion connection: temperature 590°C, pressure 10Mpa, brazing time 70min.

[0033] g) Rolling: The brazed composite material is cold-rolled to a thickness of 0.06mm.

[0034] figure 1 The cross-section metallographic photograph of the p...

Embodiment 2

[0036] Example 2 Preparation of Composite Brazing Material (2)

[0037] a) Vacuum melting of silver, copper and tin to produce silver-copper-tin ingots, the composition ratio is: 58% by weight of Ag, 30% by weight of Cu, 12% by weight of Sn; the melting temperature is 1000°C.

[0038] b) Solution treatment of silver-copper-tin ingot: 550°C, heat preservation for 2.0 hours, water quenching;

[0039] c) Rolling of silver-copper-tin ingots: cold rolling into plates to a thickness of 1 mm; each reduction is 20%.

[0040] d) Cutting: Cut the silver copper tin plate and pure silver plate to 100×100mm;

[0041] e) Pretreatment: sand the cut silver-copper-tin plate and sterling silver plate with sandpaper, clean them with alcohol, and dry them with cold air;

[0042] f) Hot press diffusion connection: temperature 570°C, pressure 9Mpa, brazing time 100min.

[0043] g) Rolling: The brazed composite material is cold rolled to a thickness of 0.04 mm.

Embodiment 3

[0044] Example 3 Preparation of Composite Brazing Material (3)

[0045] a) Vacuum melting of silver, copper and tin to produce silver-copper-tin ingots, the composition ratio is: 59% by weight of Ag, 29.5% by weight of Cu, and 11.5% by weight of Sn; the melting temperature is 1000°C.

[0046] b) Solution treatment of silver-copper-tin ingot: 530°C, heat preservation for 2 hours, water quenching;

[0047] c) Rolling of silver-copper-tin ingots: cold rolling into plates to a thickness of 2 mm; each reduction is 15%.

[0048] d) Cutting: Cut the silver copper tin plate and pure silver plate to 200×200mm:

[0049] e) Pretreatment: sand the cut silver-copper-tin plate and sterling silver plate with sandpaper, clean them with alcohol, and dry them with cold air;

[0050] f) Hot-pressed diffusion brazing connection: temperature 580°C, pressure 10Mpa, brazing time 50min.

[0051] g) Rolling: The brazed composite material is cold rolled to a thickness of 0.045 mm.

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Abstract

The invention discloses a composite brazing material and a preparation method thereof. A cross-section structure of the composite brazing material is a typical sandwich structure, alloys of two sides of the sandwich structure are silver, copper and tin, the weight percentage of the silver is 55-65%, the weight percentage of the copper is 27-35%, the weight percentage of the tin is 8-15%, and a middle layer of the sandwich structure is high-purity silver. The preparation method includes the steps: rolling to needed thickness by the aid of vacuum melting AgCuSn, linearly cutting into two plates with same sizes, grinding surfaces by abrasive paper, washing cleanness by ethyl alcohol, and drying in a blowing manner by cold air; compositing the two plates and Ag plates treated by the same modes together by a hot-pressing diffusion connection method, and preparing 0.02-0.5mm foil materials by a rolling method. The composite brazing material is excellent in brazing performance and can serve as electric vacuum solders to weld components and parts of same or different metals such as copper, nickel, steel and kovar alloys.

Description

technical field [0001] The invention relates to the field of forming and processing of composite materials, in particular to a silver-copper-tin alloy-silver composite brazing material and a preparation method thereof. Background technique [0002] The solder with a melting temperature in the range of 600-700°C is the final solder for electric vacuum devices. There are many kinds of solders in this temperature range, but the most common ones used for electric vacuum devices are silver copper tin, silver copper indium and Silver Copper Phosphorus. Among them, AgCuSn solder is mainly used as electric vacuum solder to braze components and parts of similar or dissimilar metals such as copper, nickel, steel, and Kovar alloy. However, the alloy has poor plasticity, is easy to crack during processing, and is not easy to process into a sheet. After welding, the welded layer also has poor plasticity and is easy to crack. [0003] The production methods of metal (alloy) sheet compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
CPCB23K35/0238B23K35/3006
Inventor 孙瑞涛史秀梅张国清章明溪陈立建黄晓猛
Owner BEIJING INST OF NONFERROUS METALS & RARE EARTH
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